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On products like the Tascam FW-1804 and the Digi 003 there are "Line inputs", otherwise known as analog inputs 5 though 8. If mic pre's send an unbalanced signal through TS outs then what good are these line inputs other than for direct in keyboards?
Most mic pres use balanced outs (make sure you use a balanced cable though). Guitars have unbalanced signals and should not be used in a balanced input jack.